Is China's Vaccination Program in Trouble?

China managed to vaccinate a billion people by september 20 21. Currently, its vaccine, it's distributed three billion doses of vaccine. So it's mounted the largest vaccine effort in the world. The questions that have to be asked are about the choice of vaccines and the efficacy of the vaccines they've used. A r fortyer of the population in china over the age of 80 has not been vaccinated. In hong kong its almost 70 % of the elderly citizens have not beenvaccinated.